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if the tip of a sugarcane plant is removed from the field, even then it keeps on growing in length. why?

Because Intercalary meristems are found in the the stem part of the sugarcane in whole length.

Explanation:

As we have studied about meristem regions, that these are the regions found at the nodal areas which are able of cell division and growth.  Intercalary meristem are present in the nodes of sugarcane stem which lead to the rapid increase in elongation of stem.Intercalary meristem are located at the base of leaves and nodes that leads to the increase in length. On the tip of sugarcane, apical or tip region meristem are found. When the tip region is removed, the presence of intercalary meristems play the role by facilitating the elongation of stems in sugarcane.

Please see attached image for better understanding.

Hope it helps!

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem